Saw guide



March 5, 1929. L.. c. sMr'rH 'SAW GUIDE Filed Jan. les, 1923 MSM/W iff/ 111111111 Il Patented Mar. i5, v1929.

mit.

SAW GUIDE.

Application led January 1G, 1928.v Serial No. 247,158.`

The present invention relates to improvements in saw guides, and has for an object to provide an improved guide for band saws in which the guide is adjustable, productive of less friction, and of longer life than the guides now in use.

Other objects ot' the invention are to provide a guide of extremely simple construction which admits of easy adjustment and which is capable of installment in present forms of band mills without involving any alterationin standard constructions.

With the foregoing and other objects in view,` theV invention will be more fully described hereinafter, and will be more partieularly pointed out in the claims appended hereto. y

In the drawings, wherein like symbols refer to like or corresponding parts through- -out the several views,

Figure 1 is a fragmentary plan View ot' a guide supporting arm and saw illustrating the improved guides. l

Figure 2 is an enlarged central vertical section through one of the guide pins with the core in elevation.

. Figure 3 is a central vertical section of both the core and housing and shows the core in a slightly different position from that in Figure 2, and

Figure 4 is a cross section along the line 4 4 of Figure 2 and looking in the direction of the arrows.

Referring more particularly to the drawings 5 designates generally the arm to be found in a standard band mill, having the slot 6 through which passes the band saw 7.

rlhis arm supports the guide blocks or guide pins, iii a well known manner. at one side are provided fixed guide pins 8 m any appropriate number, while at the opposite side of the band saw '7 are provided aI number of adjustable pins. The present invention is concerned with the construction of the adjustable pin.

This improved adjustable pin comprises generally a housing') of metal or other appropriate material, and a core 10, preferably of wood. 1

One end of the housing 9, which is preferablycylindrical is left open, while the other end 11 is closed and receives rotatably therethrough a threaded adjusting screw 12 having the head thereof on the exterior for the purpose of rotation and angular adjustment. A lock nut 13 on the shank of the screw 12 and spacedfrom the head thereof is arranged to engage the inner face of the end wall-11, v

whereby to restrain the screw from axial movement but to permit of the rotation thereof.`

A guide pin or lug M projects inwardly from the cylindrical side wall of the housing 9 and isada'pted to take into-aY longitudinal groove 15 made in the cylindrical external portion of the wooden core 10.

The wooden core, at its inner end, is adapted to strike the lock nut 18 and also a shoulder 16 made upon theint-erior of the housing or shell 9. rllhe shell or housing 9 is provided with the external screw threads 17, whereby the entire guide device` as a unit, may -be screwed into the usual'threaded opening` found in the, guide arm 5. Y 1

rlhe core, -besides AhavingY the longitudinal slot 15 therein, to cooperate with the pin or lug 14, is further modified by havingy produced therein kan axial recess 18 which opens through the .inner end ofthe core and traverses a substantial portion of the length thereof terminating, as indicated at 19,

whereby to leave a substantial solid and uninterrupted thickness atrtheouter portionof the core 10,7 The axial recess 18 *is intersected by a transverse through opening 2O in the core body. rlhis transverse opening is made intermediate the ends of the core and preferably, though not necessarily, nearer the inner end. In this opening 20 is inserted a brass or other plug 21, which may` also be of generally cylindrical form and having a threaded passage 22 therethrough registering with the axial recess inthe core. The threads of the passage 22 are in lead with those of the screw 12 and theaxial recess 18 may also be tapped with a like thread. The ends of the metallic `plug 21 may be Hush with diametrically opposite peripheral portions of the core body 10 and may be rounded to conform to the external cylindrical curva-l ture of the plug 10; or the length of the plug j 21 may be slightly in excess of theexternal diameter of the core 10 to permit the rounded end portions of the plug to engage the interior cylindrical wall of the cylindrical shell or housing 9; while leaving a slight clearance between the shell and the core 10.

ln the use of the device, the improved guide pins are mounted in the arm 5 by securing the housing or shell threads 17 in the threaded openings of the arm 5. The fixed i blocks 8 engage the saw 7 at one side, and

the adjustable .acores 1.0 engage the saw at the opposite side. rlhese Vguide pins may be provided in any suitable number, three being shown for purposes of illustration only. The improved pins replace those on the back side of the guide. The cores 10 are prevented from rotation due to the slot l5 and pin 14 construction. However, lthe Wooden Cores l() may be adjusted toward and from lthe .the saxv by rotating the .screws 12 Which give a minute adjustment. During the advjusting movement` of Vthe cores 10, Wear will be vtaken up by the plug 2l and Will not be allowed to devolve upon the Wooden parts.

The improved pin is to be used as a replacement of the guide pin new generally furnished fby manufacturers which usually made olf Babbitt or composition metal. This Wooden pin or core .will not heat under friction as readilyl as metal, and much greater strain Lor pressure may be brought .to bear against the blade of the saw. The lite `of the improved pin is much longer than those made of metal, and in use' does not have a tendency .to cause the saw to'harden and crack, as does the metal pin'. These improved pins may be used on both upright and horizontal band mills. 1n the -manuiacture'of the cores, lignum vitae Wood is preferable, though dog- Wood, persimmon ,or other native hardwoods may be used. j

To properly use the improved pins in an upright mill, the upper Wheel is set back onequarter inch from perpendicular. This .takes care of the vover-throw of .the saw, stifening and steadying it. In a horizontal mill, the method ot' use is the same, 4except that the pins are used in the guide operating on the sawv at the driving Wheel of the mill.

shell, a movably mounted core therein, a Wear plug in the core, and adjusting means carriec by the shell for engaging tie plug. Y

2. ln a saw mill a saw guide comprising a shell having means for mounting it in a supporting part oit' ,the mill, an axially movable core in the shell, a Wear plug embedded i in the core for engaging the shell, means between the shell. and plug for restraining the latter from rotation, and an adjusting screw carried by Athe Core for .threaded engagement vviththe plug. f

3. A guide Comprising a metallic lthreaded shell open at one end andclosed at the .opposite end, a rotary adjusting screw carried in the closed end of the shell, means for restraining the adjusting .screw from axial trffiuel, a pin projecting Within the .sh-ell, a Wooden core having a slot ,to receive said' pin and an axial recess to receive the adjusting` screw, said core also having 4a.transverse passage intersecting the recess, and a metallic Wear plug fitted in said transverse passage having rounded ,ends to engage the shell and a threaded passage in registry With the recess `for lengaging the threads of theadjusting LEONARD ennemis SMITH. 

